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<p class="purpose">The "group together" phrase in the Standard Rules needs support functions, which are compiled within the user's enclosure.</p>

<p class="commentary firstcommentary"><a id="SP1" class="paragraph-anchor"></a><b>&#167;1. </b>This section exists to support usages such as:
</p>

<pre class="displayed-code all-displayed-code code-font">
<span class="plain-syntax">    </span><span class="identifier-syntax">group</span><span class="plain-syntax"> </span><span class="identifier-syntax">containers</span><span class="plain-syntax"> </span><span class="identifier-syntax">together</span><span class="plain-syntax">;</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">group</span><span class="plain-syntax"> </span><span class="identifier-syntax">keys</span><span class="plain-syntax"> </span><span class="identifier-syntax">together</span><span class="plain-syntax">, </span><span class="identifier-syntax">giving</span><span class="plain-syntax"> </span><span class="identifier-syntax">articles</span><span class="plain-syntax">;</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">group</span><span class="plain-syntax"> </span><span class="identifier-syntax">coins</span><span class="plain-syntax"> </span><span class="identifier-syntax">together</span><span class="plain-syntax"> </span><span class="identifier-syntax">as</span><span class="plain-syntax"> </span><span class="string-syntax">"filthy lucre"</span><span class="plain-syntax">;</span>
</pre>
<p class="commentary">At the Inter level, the different groupings of an object are stored in a text
property called <span class="extract"><span class="extract-syntax">list_together</span></span>.<sup id="fnref:1"><a href="#fn:1" rel="footnote">1</a></sup> That's fine for the <span class="extract"><span class="extract-syntax">"filthy lucre"</span></span> case,
but for the other two usages we will have to make a text substitution, in order
to have a valid value here. It's those substitutions which concern us here:
</p>

<pre class="displayed-code all-displayed-code code-font">
<span class="plain-syntax">                      </span><span class="identifier-syntax">small</span><span class="plain-syntax"> </span><span class="identifier-syntax">block:</span>
<span class="plain-syntax">    ----------------&gt; </span><span class="identifier-syntax">CONSTANT_PACKED_TEXT_STORAGE</span>
<span class="plain-syntax">                      </span><span class="identifier-syntax">GTF</span><span class="plain-syntax"> </span><span class="identifier-syntax">function</span>
</pre>
<p class="commentary">A critical point is that even if the GTF functions do the same thing as each
other (and they likely do &mdash; there are only two possibilities), we need to
compile a different function each time, so that <a href="../BasicInformKit/index.html" class="internal">BasicInformKit</a> can
distinguish them as values. Thus:
</p>

<pre class="displayed-code all-displayed-code code-font">
<span class="plain-syntax">    </span><span class="identifier-syntax">group</span><span class="plain-syntax"> </span><span class="identifier-syntax">woodwind</span><span class="plain-syntax"> </span><span class="identifier-syntax">instruments</span><span class="plain-syntax"> </span><span class="identifier-syntax">together</span><span class="plain-syntax">;</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">group</span><span class="plain-syntax"> </span><span class="identifier-syntax">brass</span><span class="plain-syntax"> </span><span class="identifier-syntax">instruments</span><span class="plain-syntax"> </span><span class="identifier-syntax">together</span><span class="plain-syntax">;</span>
</pre>
<p class="commentary">must compile to
</p>

<pre class="displayed-code all-displayed-code code-font">
<span class="plain-syntax">                      </span><span class="identifier-syntax">small</span><span class="plain-syntax"> </span><span class="identifier-syntax">block:</span>
<span class="plain-syntax">    ----------------&gt; </span><span class="identifier-syntax">CONSTANT_PACKED_TEXT_STORAGE</span>
<span class="plain-syntax">                      </span><span class="identifier-syntax">GTF</span><span class="plain-syntax"> </span><span class="identifier-syntax">function</span><span class="plain-syntax"> </span><span class="constant-syntax">1</span>
<span class="plain-syntax">    ----------------&gt; </span><span class="identifier-syntax">CONSTANT_PACKED_TEXT_STORAGE</span>
<span class="plain-syntax">                      </span><span class="identifier-syntax">GTF</span><span class="plain-syntax"> </span><span class="identifier-syntax">function</span><span class="plain-syntax"> </span><span class="constant-syntax">2</span>
</pre>
<p class="commentary">even though GTF functions 1 and 2 are identical; we need them to be at different
addresses in memory.
</p>

<ul class="footnotetexts"><li class="footnote" id="fn:1"><p class="inwebfootnote"><sup id="fnref:1"><a href="#fn:1" rel="footnote">1</a></sup> For backwards compatibility with Inform 6, where this same feature was called
"list together" and not "group together".
<a href="#fnref:1" title="return to text"> &#x21A9;</a></p></li></ul>
<pre class="displayed-code all-displayed-code code-font">
<span class="reserved-syntax">typedef</span><span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="reserved-syntax">group_together_function</span><span class="plain-syntax"> {</span>
<span class="plain-syntax">    </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="identifier-syntax">inter_name</span><span class="plain-syntax"> *</span><span class="identifier-syntax">text_value_iname</span><span class="plain-syntax">;</span>
<span class="plain-syntax">    </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="identifier-syntax">inter_name</span><span class="plain-syntax"> *</span><span class="identifier-syntax">printing_fn_iname</span><span class="plain-syntax">;</span>
<span class="plain-syntax">    </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">articles_bit</span><span class="plain-syntax">; </span><span class="comment-syntax"> list with indefinite articles, or not</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">CLASS_DEFINITION</span>
<span class="plain-syntax">} </span><span class="reserved-syntax">group_together_function</span><span class="plain-syntax">;</span>
</pre>
<ul class="endnotetexts"><li>The structure group_together_function is private to this section.</li></ul>
<p class="commentary firstcommentary"><a id="SP2" class="paragraph-anchor"></a><b>&#167;2. </b>When <a href="../imperative-module/5-cii.html" class="internal">Compile Invocations Inline (in imperative)</a> wants a new GTF, it calls the
following, which returns a text literal to print a listing grouped as asked.
</p>

<pre class="displayed-code all-displayed-code code-font">
<span class="identifier-syntax">inter_name</span><span class="plain-syntax"> *</span><span class="function-syntax">GroupTogether::new</span><span class="plain-syntax">(</span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">include_articles</span><span class="plain-syntax">) {</span>
<span class="plain-syntax">    </span><span class="reserved-syntax">group_together_function</span><span class="plain-syntax"> *</span><span class="identifier-syntax">gtf</span><span class="plain-syntax"> = </span><span class="identifier-syntax">CREATE</span><span class="plain-syntax">(</span><span class="reserved-syntax">group_together_function</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">gtf</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">printing_fn_iname</span><span class="plain-syntax"> =</span>
<span class="plain-syntax">        </span><a href="4-enc.html#SP1" class="function-link"><span class="function-syntax">Enclosures::new_iname</span></a><span class="plain-syntax">(</span><span class="constant-syntax">GROUPS_TOGETHER_HAP</span><span class="plain-syntax">, </span><span class="constant-syntax">GROUP_TOGETHER_FN_HL</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">gtf</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">text_value_iname</span><span class="plain-syntax"> = </span><a href="4-tl.html#SP1" class="function-link"><span class="function-syntax">TextLiterals::small_block</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">gtf</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">printing_fn_iname</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">gtf</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">articles_bit</span><span class="plain-syntax"> = </span><span class="identifier-syntax">include_articles</span><span class="plain-syntax">;</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">desc</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Str::new</span><span class="plain-syntax">();</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">WRITE_TO</span><span class="plain-syntax">(</span><span class="identifier-syntax">desc</span><span class="plain-syntax">, </span><span class="string-syntax">"group together '%n'"</span><span class="plain-syntax">, </span><span class="identifier-syntax">gtf</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">printing_fn_iname</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">Sequence::queue</span><span class="plain-syntax">(&amp;</span><a href="4-gt.html#SP3" class="function-link"><span class="function-syntax">GroupTogether::compilation_agent</span></a><span class="plain-syntax">,</span>
<span class="plain-syntax">        </span><span class="identifier-syntax">STORE_POINTER_group_together_function</span><span class="plain-syntax">(</span><span class="identifier-syntax">gtf</span><span class="plain-syntax">), </span><span class="identifier-syntax">desc</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">gtf</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">text_value_iname</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
</pre>
<p class="commentary firstcommentary"><a id="SP3" class="paragraph-anchor"></a><b>&#167;3. </b>Again, see the DM4; this all continues to follow Inform 6 conventions.
</p>

<pre class="displayed-code all-displayed-code code-font">
<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">GroupTogether::compilation_agent</span><button class="popup" onclick="togglePopup('usagePopup1')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup1">Usage of <span class="code-font"><span class="function-syntax">GroupTogether::compilation_agent</span></span>:<br/><a href="4-gt.html#SP2">&#167;2</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">compilation_subtask</span><span class="plain-syntax"> *</span><span class="identifier-syntax">t</span><span class="plain-syntax">) {</span>
<span class="plain-syntax">    </span><span class="reserved-syntax">group_together_function</span><span class="plain-syntax"> *</span><span class="identifier-syntax">gtf</span><span class="plain-syntax"> = </span><span class="identifier-syntax">RETRIEVE_POINTER_group_together_function</span><span class="plain-syntax">(</span><span class="identifier-syntax">t</span><span class="plain-syntax">-&gt;</span><span class="identifier-syntax">data</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">packaging_state</span><span class="plain-syntax"> </span><span class="identifier-syntax">save</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Functions::begin</span><span class="plain-syntax">(</span><span class="identifier-syntax">gtf</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">printing_fn_iname</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><a href="2-ec.html#SP14" class="function-link"><span class="function-syntax">EmitCode::inv</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">IF_BIP</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><a href="2-ec.html#SP3" class="function-link"><span class="function-syntax">EmitCode::down</span></a><span class="plain-syntax">();</span>
<span class="plain-syntax">        </span><a href="2-ec.html#SP14" class="function-link"><span class="function-syntax">EmitCode::inv</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">EQ_BIP</span><span class="plain-syntax">);</span>
<span class="plain-syntax">        </span><a href="2-ec.html#SP3" class="function-link"><span class="function-syntax">EmitCode::down</span></a><span class="plain-syntax">();</span>
<span class="plain-syntax">            </span><a href="2-ec.html#SP8" class="function-link"><span class="function-syntax">EmitCode::val_iname</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">K_value</span><span class="plain-syntax">, </span><a href="2-hrr.html#SP11" class="function-link"><span class="function-syntax">Hierarchy::find</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">INVENTORY_STAGE_HL</span><span class="plain-syntax">));</span>
<span class="plain-syntax">            </span><a href="2-ec.html#SP8" class="function-link"><span class="function-syntax">EmitCode::val_number</span></a><span class="plain-syntax">(1);</span>
<span class="plain-syntax">        </span><a href="2-ec.html#SP3" class="function-link"><span class="function-syntax">EmitCode::up</span></a><span class="plain-syntax">();</span>
<span class="plain-syntax">        </span><a href="2-ec.html#SP5" class="function-link"><span class="function-syntax">EmitCode::code</span></a><span class="plain-syntax">();</span>
<span class="plain-syntax">        </span><a href="2-ec.html#SP3" class="function-link"><span class="function-syntax">EmitCode::down</span></a><span class="plain-syntax">();</span>
<span class="plain-syntax">            </span><a href="2-ec.html#SP14" class="function-link"><span class="function-syntax">EmitCode::inv</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">SETBIT_BIP</span><span class="plain-syntax">);</span>
<span class="plain-syntax">            </span><a href="2-ec.html#SP3" class="function-link"><span class="function-syntax">EmitCode::down</span></a><span class="plain-syntax">();</span>
<span class="plain-syntax">                </span><a href="2-ec.html#SP13" class="function-link"><span class="function-syntax">EmitCode::ref_iname</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">K_value</span><span class="plain-syntax">, </span><a href="2-hrr.html#SP11" class="function-link"><span class="function-syntax">Hierarchy::find</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">C_STYLE_HL</span><span class="plain-syntax">));</span>
<span class="plain-syntax">                </span><a href="2-ec.html#SP8" class="function-link"><span class="function-syntax">EmitCode::val_iname</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">K_value</span><span class="plain-syntax">, </span><a href="2-hrr.html#SP11" class="function-link"><span class="function-syntax">Hierarchy::find</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">ENGLISH_BIT_HL</span><span class="plain-syntax">));</span>
<span class="plain-syntax">            </span><a href="2-ec.html#SP3" class="function-link"><span class="function-syntax">EmitCode::up</span></a><span class="plain-syntax">();</span>
<span class="plain-syntax">            </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (!(</span><span class="identifier-syntax">gtf</span><span class="plain-syntax">-&gt;</span><span class="element-syntax">articles_bit</span><span class="plain-syntax">)) {</span>
<span class="plain-syntax">            </span><a href="2-ec.html#SP14" class="function-link"><span class="function-syntax">EmitCode::inv</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">SETBIT_BIP</span><span class="plain-syntax">);</span>
<span class="plain-syntax">            </span><a href="2-ec.html#SP3" class="function-link"><span class="function-syntax">EmitCode::down</span></a><span class="plain-syntax">();</span>
<span class="plain-syntax">                </span><a href="2-ec.html#SP13" class="function-link"><span class="function-syntax">EmitCode::ref_iname</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">K_value</span><span class="plain-syntax">, </span><a href="2-hrr.html#SP11" class="function-link"><span class="function-syntax">Hierarchy::find</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">C_STYLE_HL</span><span class="plain-syntax">));</span>
<span class="plain-syntax">                </span><a href="2-ec.html#SP8" class="function-link"><span class="function-syntax">EmitCode::val_iname</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">K_value</span><span class="plain-syntax">, </span><a href="2-hrr.html#SP11" class="function-link"><span class="function-syntax">Hierarchy::find</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">NOARTICLE_BIT_HL</span><span class="plain-syntax">));</span>
<span class="plain-syntax">            </span><a href="2-ec.html#SP3" class="function-link"><span class="function-syntax">EmitCode::up</span></a><span class="plain-syntax">();</span>
<span class="plain-syntax">            }</span>
<span class="plain-syntax">            </span><a href="2-ec.html#SP14" class="function-link"><span class="function-syntax">EmitCode::inv</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">CLEARBIT_BIP</span><span class="plain-syntax">);</span>
<span class="plain-syntax">            </span><a href="2-ec.html#SP3" class="function-link"><span class="function-syntax">EmitCode::down</span></a><span class="plain-syntax">();</span>
<span class="plain-syntax">                </span><a href="2-ec.html#SP13" class="function-link"><span class="function-syntax">EmitCode::ref_iname</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">K_value</span><span class="plain-syntax">, </span><a href="2-hrr.html#SP11" class="function-link"><span class="function-syntax">Hierarchy::find</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">C_STYLE_HL</span><span class="plain-syntax">));</span>
<span class="plain-syntax">                </span><a href="2-ec.html#SP8" class="function-link"><span class="function-syntax">EmitCode::val_iname</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">K_value</span><span class="plain-syntax">, </span><a href="2-hrr.html#SP11" class="function-link"><span class="function-syntax">Hierarchy::find</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">NEWLINE_BIT_HL</span><span class="plain-syntax">));</span>
<span class="plain-syntax">            </span><a href="2-ec.html#SP3" class="function-link"><span class="function-syntax">EmitCode::up</span></a><span class="plain-syntax">();</span>
<span class="plain-syntax">            </span><a href="2-ec.html#SP14" class="function-link"><span class="function-syntax">EmitCode::inv</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">CLEARBIT_BIP</span><span class="plain-syntax">);</span>
<span class="plain-syntax">            </span><a href="2-ec.html#SP3" class="function-link"><span class="function-syntax">EmitCode::down</span></a><span class="plain-syntax">();</span>
<span class="plain-syntax">                </span><a href="2-ec.html#SP13" class="function-link"><span class="function-syntax">EmitCode::ref_iname</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">K_value</span><span class="plain-syntax">, </span><a href="2-hrr.html#SP11" class="function-link"><span class="function-syntax">Hierarchy::find</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">C_STYLE_HL</span><span class="plain-syntax">));</span>
<span class="plain-syntax">                </span><a href="2-ec.html#SP8" class="function-link"><span class="function-syntax">EmitCode::val_iname</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">K_value</span><span class="plain-syntax">, </span><a href="2-hrr.html#SP11" class="function-link"><span class="function-syntax">Hierarchy::find</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">INDENT_BIT_HL</span><span class="plain-syntax">));</span>
<span class="plain-syntax">            </span><a href="2-ec.html#SP3" class="function-link"><span class="function-syntax">EmitCode::up</span></a><span class="plain-syntax">();</span>

<span class="plain-syntax">        </span><a href="2-ec.html#SP3" class="function-link"><span class="function-syntax">EmitCode::up</span></a><span class="plain-syntax">();</span>
<span class="plain-syntax">    </span><a href="2-ec.html#SP3" class="function-link"><span class="function-syntax">EmitCode::up</span></a><span class="plain-syntax">();</span>

<span class="plain-syntax">    </span><a href="2-ec.html#SP15" class="function-link"><span class="function-syntax">EmitCode::rfalse</span></a><span class="plain-syntax">();</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">Functions::end</span><span class="plain-syntax">(</span><span class="identifier-syntax">save</span><span class="plain-syntax">);</span>
<span class="plain-syntax">}</span>
</pre>
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